When an object is thrown in vertically upward direction, why the final velocity is 0
You throw the ball vertically upwards with some velocity say v1, which we will consider as the initial velocity for the upward path.
After certain time period say t, the ball reaches a height beyond which it can’t move upwards anymore and stops there i.e. its velocity becomes zero at that height.
The height where the velocity becomes zero which is the maximum height the ball went upward, say is H. And for this upward movement, the final velocity v2 is 0 because the ball has stopped at the end of this upward traversal.